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Note 2 - Stock-based Compensation - Stock Incentive Plan Activities (Details) - Incentive Plan [Member]
shares in Thousands
 6 Months Ended
Jun. 30, 2017
$ / shares
shares
Awards Available (in shares) 2,273
Options Outstanding (in shares) 12,095
Weighted Average Exercise Price (in dollars per share) | $ / shares $ 6.55
Plan amendment (in shares) 1,000
Stock option awards granted (in shares) (2,563)
Stock option awards granted (in shares) 2,563
Options Outstanding (in shares) 13,413
Stock option awards granted (in dollars per share) | $ / shares $ 5.49
Stock option awards exercised (in shares) (368)
Stock option awards exercised (in dollars per share) | $ / shares $ 3.37
Stock option awards cancelled (in shares) 877
Stock option awards cancelled (in shares) (877)
Stock option awards cancelled (in dollars per share) | $ / shares $ 10.30
Awards Available (in shares) 1,578
Weighted Average Exercise Price (in dollars per share) | $ / shares $ 6.19
Restricted Stock Units (RSUs) [Member]  
Restricted stock unit awards granted (in shares) (11)
Restricted stock unit awards cancelled (in shares) 2